Alert archive / Iowa / Flash Flood Warnings in 2016

Flash Flood Warning 33, NWS Des Moines, IA

September 22, 2016Butler County, Iowa

NWS Des Moines, IA issued this flash flood warning at Sep 22, 2016, 7:00 AM CDT for Butler County, Iowa. It was in force for 4 hr. 2 reports came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued
Sep 22, 2016, 7:00 AM CDT (12:00 UTC)
Expired
Sep 22, 2016, 11:00 AM CDT
In force
4 hr
Issued by
NWS Des Moines, IA
Area
Storm-based polygon
Flood severity
None

County Butler County, IA

The radar

The Des Moines radar (KDMX), 146 km from the middle of the area, began a volume at 12:00 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

What was reported inside it

TimeReportWhereRemark
Sep 22, 8:00 AM CDTHEAVY RAIN 2.3Clarksville, IACOCORAHS STATION CLARKSVILLE /IA-BU-3/.
Sep 22, 8:26 AM CDTFLASH FLOODGreene, IADELAYED REPORT. MOST ROADS CLOSED IN AND AROUND GREENE. THE ONLY WAY TO ACCESS THE TOWN IS VIA HIGHWAY 14. .

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Davenport, (KDVN), launched 12:00Z, 0.0 hours before the alert went out and 231 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-pSkew-T log-p diagram, Davenport, at 12:00Z on 2016-09-22Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 114 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Davenport, at 12:00Z on 2016-09-22The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 147 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
114 J/kg
Mixed-layer CIN
-348 J/kg
Mixed-layer LCL
1393 m above ground
0-6 km bulk shear
35 kt
0-1 km storm-relative helicity
147 m²/s²
0-3 km storm-relative helicity
145 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

847 
WGUS53 KDMX 221200
FFWDMX
IAC023-221600-
/O.NEW.KDMX.FF.W.0033.160922T1200Z-160922T1600Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE DES MOINES IA
700 AM CDT THU SEP 22 2016

THE NATIONAL WEATHER SERVICE IN DES MOINES  HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  NORTHERN BUTLER COUNTY IN NORTH CENTRAL IOWA...

* UNTIL 1100 AM CDT.

* AT 659 AM CDT...LOCAL LAW ENFORCEMENT OFFICIALS REPORTED OVER 7
  INCHES OF RAIN HAD FALLEN ACROSS THE WARNED AREA. FLASH FLOODING
  IS OCCURRING.  EVACUATIONS ARE OCCURRING IN THE TOWN OF GREENE AND
  PEOPLE ARE ENCOURAGED TO REMAIN AWAY FROM THE TOWN.  

* SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...
  CLARKSVILLE AND GREENE. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TURN AROUND...DON'T DROWN WHEN ENCOUNTERING FLOODED ROADS. MOST FLOOD
DEATHS OCCUR IN VEHICLES.

&&

LAT...LON 4274 9256 4284 9292 4290 9301 4291 9299
      4291 9256

$$

COGIL
2 follow-up statements
155 
WGUS73 KDMX 221353
FFSDMX

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE DES MOINES IA
853 AM CDT THU SEP 22 2016

IAC023-221600-
/O.CON.KDMX.FF.W.0033.000000T0000Z-160922T1600Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BUTLER IA-
853 AM CDT THU SEP 22 2016

...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 1100 AM CDT FOR
NORTHERN BUTLER COUNTY...

AT 840 AM CDT...LOCAL LAW ENFORCEMENT REPORTED FLASH FLOODING ACROSS
MUCH OF NORTHERN BUTLER COUNTY...WITH MANY ROADS IMPASSABLE.
OFFICIALS HAVE ALREADY REPORTED OVER 7 INCHES OF RAINFALL WITH
MODERATE RAINFALL CONTINUING THIS MORNING. FLASH FLOODING IS
OCCURRING IN GREENE WITH SEVERAL STREETS UNDERWATER AND WATER
RESCUES TAKING PLACE.  EVACUATIONS ARE OCCURRING AND NON-
EMERGENCY STAFF ARE ENCOURAGED TO REMAIN AWAY FROM GREENE.

SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...
CLARKSVILLE AND GREENE. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TURN AROUND...DON'T DROWN WHEN ENCOUNTERING FLOODED ROADS. MOST FLOOD
DEATHS OCCUR IN VEHICLES.

STAY AWAY OR BE SWEPT AWAY. RIVER BANKS AND CULVERTS CAN BECOME
UNSTABLE AND UNSAFE.

&&

LAT...LON 4274 9256 4284 9292 4290 9301 4291 9299
      4291 9256

$$

MF
746 
WGUS73 KDMX 221609
FFSDMX

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE DES MOINES IA
1109 AM CDT THU SEP 22 2016

IAC023-221615-
/O.EXP.KDMX.FF.W.0033.000000T0000Z-160922T1600Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BUTLER IA-
1109 AM CDT THU SEP 22 2016

...THE FLASH FLOOD WARNING FOR NORTHERN BUTLER COUNTY HAS EXPIRED...

HEAVY RAIN HAS ENDED AT THIS TIME ACROSS NORTHERN BUTLER
COUNTY...THUS THE FLASH FLOOD WARNING HAS BEEN ALLOWED TO EXPIRE.
HOWEVER, RESIDUAL FLOODING WILL CONTINUE TO TAKE PLACE ON CREEKS,
RIVERS, AND STREAMS DOWNSTREAM OF WHERE THE HEAVY RAIN FELL. PLEASE
CONTINUE TO HEED ANY REMAINING ROAD CLOSURES.

LAT...LON 4274 9256 4284 9292 4290 9301 4291 9299
      4291 9256

$$

MF

The office that day

Everything else NWS Des Moines, IA issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Sep 21, 7:05 PM CDTSevere Thunderstorm WarningDMXCerro Gordo55 min
Sep 21, 7:16 PM CDTTornado WarningDMXCerro Gordo13 min
Sep 21, 7:43 PM CDTTornado WarningDMXBremer, Butler47 min
Sep 21, 8:26 PM CDTSpecial Weather StatementDMXBremer64 min
Sep 21, 8:54 PM CDTFlash Flood WarningDMXBremer6 hr
Sep 21, 9:05 PM CDTSpecial Weather StatementDMXBremer40 min
Sep 21, 9:39 PM CDTRiver Flood WarningDMXBlack Hawk, Bremer, Butler5 days
Sep 21, 9:40 PM CDTRiver Flood WarningDMXBlack Hawk8 days
Sep 21, 9:41 PM CDTRiver Flood WarningDMXBlack Hawk, Bremer, Butler6 days
Sep 21, 9:50 PM CDTRiver Flood WarningDMXCerro Gordo, Floyd, Worth4 days
Sep 21, 10:51 PM CDTAreal Flood WarningDMXCerro Gordo, Franklin, Worth48 hr
Sep 22, 3:05 AM CDTAreal Flood WarningDMXBremer24 hr
Sep 22, 4:13 AM CDTFlash Flood WarningDMXCerro Gordo, Hancock6 hr
Sep 22, 10:22 AM CDTRiver Flood WarningDMXWright6 days
Sep 22, 11:23 AM CDTAreal Flood WarningDMXBremer, Butler24 hr

Nearby

Flash Flood Warnings in Iowa, 2016Every flash flood warning in 2016

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.